What does “@” symbol mean in “import { Component } from ‘@angular/core’;” statement?

Also of relevance is that you can use the @ symbol scoping for non-npm packages as well. You can use this in your project as a short way of referring to different directories.

i.e.

import { MyService } from '@services/my.service';
import { HelloWorldComponent } from '@components/hello-world.component';

instead of

import { MyService } from '../../../../my.service';
import { HelloWorldComponent } from '../shared/deeply/nested/hello-world/hello-world.component';

To do this, you simply configure your tsconfig.json file (at root of project) like this:

{
  "compileOnSave": false,
  "compilerOptions": {

    // omitted...

    "baseUrl": "src",
    "paths": {
      "@services/*": ["app/path/to/services/*"],
      "@components/*": ["app/somewhere/deeply/nested/*"],
      "@environments/*": ["environments/*"]
    }
  }
}

See the full details at Angular Firebase